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Datacenter Placement and Data Transfer Costs¶
When running a multi-DC ScyllaDB Cloud cluster, data is replicated across datacenters. The cost of that replication depends on where the datacenters are placed relative to each other and to your application.
Same-Region Placement¶
Placing datacenters within the same cloud region as your application minimizes data transfer costs. Traffic between nodes in the same region is typically billed at intra-region rates, which are lower than cross-region rates.
Cross-Region Replication¶
If your architecture requires datacenters in different regions — for example, for geographic redundancy or to serve users in multiple locations — replication traffic will cross region boundaries. This incurs cross-region data transfer charges from your cloud provider.
To reduce the impact:
Use Local Quorum consistency for reads and writes where possible. This avoids cross-DC coordination on every request and limits cross-region traffic to background replication only.
Add only as many datacenters as your availability and latency requirements demand. Each additional datacenter multiplies replication traffic.
For instructions on adding a datacenter, see Adding a Datacenter.